Is it allowed to play two accounts from the same IP address? ... Does the site have a mechanism to monitor this?

No, only one user name is allowed from the same IP address. Not only for the tournament but also generally.
It's automatically not possible to create a second user name.

Does the site have a mechanism to monitor this?
Yes for the creation. Can you make moves from the same IP on two different accounts. Does this control? I do not care about me, rather for security reasons I ask

Does the site have a mechanism to monitor this?
Yes for the creation. Can you make moves from the same IP on two different accounts. Does this control? I do not care about me, rather for security reasons I ask

Does the site have a mechanism to monitor this?
Yes for the creation. Can you make moves from the same IP on two different accounts. Does this control? I do not care about me, rather for security reasons I ask

Yes, but it can be monitored for check.

This is not good, because I can create somewhere and then play both players in a one tournament at home and I will actually have a spy.

This is not good, because I can create somewhere and then play both players in a one tournament at home and I will actually have a spy.

Sometimes such a loophole comes useful, when man & wife or father & son need two user names for one computer.

Before the tournament all names are evaluated for possible multiple names, it only happened a couple of times.
Last year all players were even from different countries and cities very far from each other.

This is not good, because I can create somewhere and then play both players in a one tournament at home and I will actually have a spy.

Sometimes such a loophole comes useful, when man & wife or father & son need two user names for one computer.

Before the tournament all names are evaluated for possible multiple names, it only happened a couple of times.
Last year all players were even from different countries and cities very far from each other.

2.5 months of signing in before the tournament (July, August and half September) with an Are-You-Sure.

That everybody can join. We had several new names again, who turned out to be strong players, and again a new name made it to the top final.

Tournament start at September 15th well after summer.

Using the Thue-Morse sequence to distribute players in even groups for Round 1.

Splitting the tournament into two rounds, and splitting both Round 1 and Round 2 into five subgroups. The resulting 5-6 players for each group was adequate.

That the games were hidden for the public to see until they finished (hat tip: edmond-dantes).

That only one player from each Round 1 group went to the top final (two in case of equal results).

That Copenhagen Hnefatafl 11x11 was used for both rounds (and that no Round 1 games were transferred to Round 2). Thus all top finalists were really strong in precisely this variant, and that made for a string of sublime top games.

The Copenhagen Hnefatafl 11x11 rules were very suitable for an important tournament like this. The rules proved themselves again an efficient framework for interesting tafl games with a lot of drama and surprices, draws extremely rare and the best man to win in the end.

The timeout method worked well. 1 day per move and 8 days buffer, time per move reduced after 10 days. 53 games timed out; however 22 of the timeouts were players' way of leaving the tournament. Left are 31 timeouts (14%).

Even with a Round 3, the winner was found after 83 days (last year 80 days), and the whole tournament was finished after 87 days (last year 91 days).

If a player didn't move at all during the first nine days of a round, he was removed. Also a player who caused more than half of his Round games to time out, was disqualified. 13 players were disqualified by these rules.

Use of the Sonneborn-Berger principle a.o. in case of a tie.

Valhalla Final with the 6 strongest players, and that all players had their Round 2 Final.

This year we happened to have an umpire which was completely outside the tournament.

Accidentally Round 1 was completely finished before start of Round 2, because it was necessary to await the result of an important game.

The players were given a full day notice between rounds.

That the top final tie between the two top players was solved with a Round 3 between these two.

That Steiger kindly offered an attractive prize for the winner. This made everyone fight very hard!

What could be improved next year.

A new rule: If the top final group is all fully determined, but we're still waiting for unfinished games in Round 1, then a preliminary result of these games can be judged by the umpire for use at distributing players for Round 2, so that Round 2 can start right away. The game results can preliminarily be judged:
- white wins
- black wins
- draw
- undetermined; points are calculated by probability from ratings
(accidentally there wasn't need for such a rule this year)

Two new rules for solving ties, to use after the ones we already have. Not to be used in the top final and not to be used in games involving the three highest ranking players.
- The player who wins with the shortest game length is the winner.
- In the case of this being equal: The player who captured the most pieces in their winning game is the winner.

Congratulations to World Tafl Federation Champion 2017, Alexandre Bour ("Plantagenet"), Châlons-en-Champagne, FR!Many thanks to Adam Bartley for being umpire, and to the 29 players who played in the tournament!

The triathlon tournament 2015 took 148 dage = 5 months to finish.
And 5 long months it was with the same group of 14 players where others could not join in after the combined tournament had started.
The internet seems not a very suitable place for a complex event like this, it takes a very long time to complete.

I would propose to split the planned triathlon into separate tournaments:

Right now we have the Berserk tournament. Winner is Tafl Berserker 2018.

I would propose that before the Sea Battle tournament, it is explored if it is possible to do away with the "dead corner squares", where a ship cannot be captured:In a corner, a ship could be captured from the two neighbouring edge squares, as is the case on all other edge squares.

The triathlon tournament 2015 took 148 dage = 5 months to finish.
And 5 long months it was with the same group of 14 players where others could not join in after the combined tournament had started.
The internet seems not a very suitable place for a complex event like this, it takes a very long time to complete.

I would propose to split the planned triathlon into separate tournaments:

The three tournaments (Berserk, Sea Battle 11x11 and Historical 13x13) were this year finished in just 94 days total = 3 months.
14 players participated in one or more of the three tournaments.

The first plan was to have a triathlon, and including Copenhagen Hnefatafl from the world champ. tourn. it's actually possible to calculate results of a quadrathlon of these four tournaments. The quadrathlon was calculated only for the 8 players who participated in at least two of the four tournaments.